ci: Fix kas branch issue with version 4.3.2

With kas 4.3, yml files need to set a branch for a specific commit since kas now checks whether the target branch contains the specific commit or not. This creates an issue on meta-cassini CI since meta-cassini-bsp triggers a CI pipeline without setting the branch parameter dynamically. This commit adds the change to set the branch parameter dynamically to fix this issue.

Signed-off-by: Emekcan Aras Emekcan.Aras@arm.com